CIE A Level Chemistry復習筆記3.5.5 Iodoform Reaction
Iodoform Reaction
- Tri-iodomethane?(also called?iodoform) forms a?yellow precipitate?with?methyl ketones
- Methyl ketones are compounds that have a CH3CO-group
- Ethanal?also contains a CH3CO- group and therefore also forms a yellow precipitate with iodoform
- The reagent is?heated?with an?alkaline?solution of?iodine
- This reaction involves a?halogenation?and?hydrolysis?step
- In the?halogenation?step, all three H-atoms in the -CH3 (methyl) group are replaced with iodine atoms,?forming a?-CI3 group
- The intermediate compound is hydrolysed by an?alkaline?solution to form a sodium salt (RCO2- Na+) and a yellow precipitate of?CHI3
The reaction of ethanal with iodoform results in the formation of a yellow CHI3 precipitate轉(zhuǎn)載自savemyexams
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